Method and apparatus for reproducing sounds.



H. RUIVIIVILER. METHOD AND APPARATUS FOR REPRODUCING APPLICATION FILED APR. I6I I912.

SOUNDS.

Patented May 16, 1916.

RUDOW RUMIVILER, 0F DAYTON, OHIO.

METHOD AND APPARATUS FOR REPRODUCING SOUNDS.

Specification of Letters Patent.

Patented May 116, 1916.

Application filed April 16. 1912. Serial No. 691,145.

To all whom it may concern Be it known that I, RUnow RUMMLER, a citizen of the United States, residing atv Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Methods and Apparatus for Reproducing Sounds, of which I declare the following to be a full, clear, and exact description.

This invention relates to a method and an apparatus for the reproduction of vocal sounds.

The prime objects of the invention are to decrease residual effects in telephone re ceivers, and to provide a method of operation and. a structure permitting the selection of diaphragms from a wide range of materials having different enunciative properties. To accomplish these objects, means are provided for vibrating dielectric diaphragms by inducing molecular stresses therein, these molecular stresses resulting in a bodily vibration of the diaphragm.

The accompanying illustration is diagrammatic and shows a diaphragm 1 which may be of any material, but for the purposes of this description it is assumed to be a thin sheet of glass although other dielectrics of high inductive capacity may be employed. The diaphragm is located between a pair of coils 2 and 3 connected in series or parallel to telephone line wires, the object of the construction being to permit high inductive action to take place across the intervening diaphragm and in accordance to variations of the line current when transmitting vocal sounds. A mass of metal not in the line circuit will therefore serve the purpose of one of the coils; however, a single coil is effective. The two coils are in close inductive relation. Thus a powerful flux in proportion to the energy impressed on the coils passes through the diaphragm 1. The coils, to intensify the action, have their convolutions cemented together by dielectrics of high inductive capacity terminating in the plane surfaces 4 and 5 opposite the diaphragm. The insulating lacquers and varnishes of commerce, complying with the usual requirements of such substances, serve this purpose, those having relatively hlgh inductive capacity being preferred.

By the above arrangement of coils and diaphragm, a changing dielectric stress in the latter, due to the passage through the coils of a current having speech characteristics, causes it to vibrate accordingly an thus reproduce the desired sounds.

For the purpose of completing the illustration, a sound amplifying horn of usual function is indicated at 6 leading to the center of one of the air spaces or to both as by providing a central opening in the diaphragm. The horn is supported by the instruments casing 7 In operation a current varying according to speech characteristics, in passing around the coils causes a varying flux between the same to vary the disposition of the molecules of,-and therefore the tension of the dielectric diaphragm causing it to vibrate in harmony with the current and thus reproduce speech.

The iron losses occurring in magnetically operated receivers are not necessarily a factor, while the multiplying effect of coils is taken full advantage of. As a consequence of the absence of iron losses, the instrument preserves the true proportion between vibrations of different amplitudes.

The principle of the apparatus is such that it may be varied in size and proportions to suit different requirements as to use and circuit conditions.

The arrangement of inductors 2 and 3 is such that powerful molecular stresses may be effected in the intervening air and augmented by a diaphragm or resonant board of any material.

It is believed that the invention possesses the required novelty as to its mode of operation and design as to entitle it to broad protection in the matter of equivalents.

What is claimed is 1- 1. The art of reproducing vocal sounds by vibrating a dielectric through molecular stresses induced in the same.

2. In a telephone, a pair of coils of wire, and a vibratable dielectric between the coils and arranged therewith to be vibrated by molecular stresses induced in said dielectric and thus produce sounds.

3. A diaphragm of dielectric material and means for inducing molecular stresses therein for the purpose of vibrating the same.

4;. In a telephone, a diaphragm of dielectric material and an inductor coil for inducing molecular stresses in the diaphragm.

'5. In a telephone, a dielectric diaphragm, and a spiral inductor coil opposite each face of the diaphragm adapted to vibrate the diaphragm by inducing molecular stresses vibrating a'dielectric diaphragm by inductherein. ing electrical stresses therein. 10

(3. In a telephone, a coil of Wire, a con- In testimony whereof I affix my signature ducting element inductively associated with in the presence of two witnesses. 5 the coil, and a dielectric diaphragm mount- RUDOW' RUMMLER.

ed to vibrate between the same'as a result Witnesses: of molecular stresses induced therein. J. BYRON RIoKE'r'rs,

. 7 The method of producing sounds by CARn W.- BEUST. 

